<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
    <meta name="description" content="Demonstration of imagery layers with rectangular cutouts.">
    <meta name="cesium-sandcastle-labels" content="Tutorials">
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script type="text/javascript" src="../../../Build/CesiumUnminified/Cesium.js" nomodule></script>
    <script type="module" src="../load-cesium-es6.js"></script>
</head>
<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
<style>
    @import url(../templates/bucket.css);
</style>
<div id="cesiumContainer" class="fullSize"></div>
<div id="loadingOverlay"><h1>Loading...</h1></div>
<div id="toolbar">
    <table class="infoPanel">
        <tbody>
        <tr>
            <td>Click on the Cesium display to start.</td>
        </tr>
        <tr>
            <td>w/s - move cutout north/south</td>
        </tr>
        <tr>
            <td>a/d - move cutout west/east</td>
        </tr>
        </tbody>
    </table>
</div>
<script id="cesium_sandcastle_script">
function startup(Cesium) {
    'use strict';
//Sandcastle_Begin
var viewer = new Cesium.Viewer('cesiumContainer', {
    imageryProvider : new Cesium.TileMapServiceImageryProvider({
        url : Cesium.buildModuleUrl('Assets/Textures/NaturalEarthII')
    }),
    baseLayerPicker : false
});

var canvas = viewer.canvas;
canvas.setAttribute('tabindex', '0'); // needed to put focus on the canvas
canvas.onclick = function() {
    canvas.focus();
};

var scene = viewer.scene;

var defaultImageryLayerCutout = Cesium.Rectangle.fromDegrees(-90, 20, -70, 40);

// Cut a rectangle out of the base layer
var layers = viewer.imageryLayers;
var imageryBaseLayer = layers.get(0);

imageryBaseLayer.cutoutRectangle = defaultImageryLayerCutout;

// Fit a SingleTileImageryProvider inside the cutout on the lowest layer
layers.addImageryProvider(new Cesium.SingleTileImageryProvider({
    url : '../images/Cesium_Logo_overlay.png',
    rectangle : defaultImageryLayerCutout
}));

// Add an Earth at Night layer and a "traveling" cutout
var earthAtNight = layers.addImageryProvider(new Cesium.IonImageryProvider({ assetId: 3812 }));
earthAtNight.cutoutRectangle = Cesium.Rectangle.fromDegrees(-100, 10, -60, 50);
earthAtNight.alpha = 0.9;

// "traveling" code
var flags = {
    moveEast : false,
    moveWest : false,
    moveNorth : false,
    moveSouth : false
};

function getFlagForKeyCode(keyCode) {
    switch (keyCode) {
    case 'W'.charCodeAt(0):
        return 'moveNorth';
    case 'S'.charCodeAt(0):
        return 'moveSouth';
    case 'D'.charCodeAt(0):
        return 'moveEast';
    case 'A'.charCodeAt(0):
        return 'moveWest';
    default:
        return undefined;
    }
}

document.addEventListener('keydown', function(e) {
    var flagName = getFlagForKeyCode(e.keyCode);
    if (typeof flagName !== 'undefined') {
        flags[flagName] = true;
    }
}, false);

document.addEventListener('keyup', function(e) {
    var flagName = getFlagForKeyCode(e.keyCode);
    if (typeof flagName !== 'undefined') {
        flags[flagName] = false;
    }
}, false);

var moveIncrement = 0.05;
viewer.clock.onTick.addEventListener(function(clock) {
    var travelingRectangle = earthAtNight.cutoutRectangle;
    if (flags.moveNorth && travelingRectangle.north + moveIncrement < Cesium.Math.PI_OVER_TWO) {
        travelingRectangle.north += moveIncrement;
        travelingRectangle.south += moveIncrement;
    }
    if (flags.moveSouth && travelingRectangle.south - moveIncrement > -Cesium.Math.PI_OVER_TWO) {
        travelingRectangle.north -= moveIncrement;
        travelingRectangle.south -= moveIncrement;
    }
    if (flags.moveEast) {
        travelingRectangle.east += moveIncrement;
        travelingRectangle.west += moveIncrement;
    }
    if (flags.moveWest) {
        travelingRectangle.east -= moveIncrement;
        travelingRectangle.west -= moveIncrement;
    }
    travelingRectangle.east = wrapLongitude(travelingRectangle.east);
    travelingRectangle.west = wrapLongitude(travelingRectangle.west);
});

function wrapLongitude(value) {
    if (value < -Cesium.Math.PI) {
        return value + Cesium.Math.TWO_PI;
    }
    if (value > Cesium.Math.PI) {
        return value - Cesium.Math.TWO_PI;
    }
    return value;
}

//Sandcastle_End
    Sandcastle.finishedLoading();
}
if (typeof Cesium !== 'undefined') {
    window.startupCalled = true;
    startup(Cesium);
}
</script>
</body>
</html>
